| 摘要 |
<p>PURPOSE:To obtain the title thermogenic substance capable of optionally setting heating time and temperature, by adding a specific hafnium compound, etc., for controlling hydrating exothermic temperature to quick lime and light burned magnesia lime as main raw materials. CONSTITUTION:The aimed thermogenic substance obtained by containing (B) 0-50 pts.wt. acetic acid, mineral acid, mineral acid having a lower oxidation number or salts thereof (compounds) and hafnium-containing zircon sand, zirconia, silica fume formed from zircon as a by-product, hafnium compound and hafnium-containing mineral powder, anhydrite and/or calcium chelating agent as a regulating material capable of freely regulating hydration exothermic temperature of (A) quick lime or light burned magnesia lime as main raw materials therefor to a temperature of 90-300 deg.C in the component (A) and adding the resultant mixture to hydrating water.</p> |
